Based on Data Collected from Its Production Processes, Crosstiles Inc

Multiple Choice

Based on data collected from its production processes, Crosstiles Inc. determines that the breaking strength of its most popular porcelain tile is normally distributed with a
Mean of 400 pounds per square inch and a standard deviation of 12.5 pounds per square
Inch. Based on the 68-95-99.7 Rule, about what percent of its popular porcelain tile will
Have breaking strengths between 375 and 425 pounds per square inch?

A) 95%
B) 68%
C) 84%
D) 32%
E) 47.5%